I thought that you might like a better look at the mural on the wall here.
There's an inscription on the scroll at the bottom left hand side of the wall.
It says:
Festival Mural 1984. A sponsored art project organised by Gateways.
Generously funded by the citizens, local businesses, and visitors to
Canterbury. Painted by John Jones, assisted by Adam Taylor and senior
students from the Canterbury College of Art.